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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 24 |
| 4 | 94 |
| 5 | 370 |
| 6 | 1532 |
| 7 | 6430 |
| 8 | 27613 |
| 9 | 120105 |
| 10 | 529004 |
| 11 | 2353732 |
| 12 | 10560201 |
| 13 | 47741258 |
| 14 | 217182975 |
| 15 | 993689378 |
| 16 | 4569028343 |
| 17 | 21102587065 |
| 18 | 97856367075 |
| 19 | 455411592395 |
| 20 | 2126424240714 |
| 21 | 9958391469555 |
| 22 | 46764973042169 |
| 23 | 220162782395164 |
| 24 | 1038904706385757 |
| 25 | 4912935500411391 |
| 26 | 23279408557702152 |
| 27 | 110512017376178793 |
[1,2,7,24,94,370,1532,6430,27613,120105,529004, 2353732,10560201,47741258,217182975,993689378, 4569028343,21102587065,97856367075,455411592395, 2126424240714,9958391469555,46764973042169, 220162782395164,1038904706385757,4912935500411391, 23279408557702152,110512017376178793] |